What does it mean to say the mass is conserved during a physical change ?

How will the system respond to a temperature increase?

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

What causes the formation of ocean currents?